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Home Overview Subwoofer Sub F-12 SPH-380 SPH-380/2 SPH-450

Subwoofer Kit SPH-450/BR

Enormous subwoofer for home cinema with deep, powerful bass

Data:
- size (HxWxD): 61x75x70 cm
- impedance: 8 Ohm (2 x 4 Ohm)
- sensitivity: 92 dB
- max. SPL (1m): 115 dB
  (closed version: 117 dB)
- output with DT 300: 200 Watt into 8 Ohm
  (300 Watt into 4 Ohm closed version)
- frequency range (-8dB): from 21 Hz

If an extremely powerful subwoofer is required this speaker needs to be able to move a lot of air. This can be achieved by a large diaphragm (or several smaller ones) and a big excursion. Big excursion (or long throw) is commonly found in larger loudspeakers.

The Monacor SPH-450 TC bass driver is one of this type. The driver features a twin voice coil with 2 x 4 Ohm. A power handling of 700 Watt RMS. The driver supplied with this kit was optimally tuned for hi-fi and home cinema.

Monacor SPH-450TC

Taking all this into consideration a subwoofer was developed that could be built in four different versions:

  • as a closed cabinet subwoofer
  • as a closed cabinet subwoofer with 9 Ohm dropping resistor
  • as a bass reflex subwoofer, Type I with 2.7 Ohm dropping resistor
  • as a modern. Low tuned bass reflex subwoofer, Type II
This gives you - even after completion - the opportunity to go for low bass or precision.
verschiedene Abstimmungen simuliert mit Boxcalc und an den gemessenen Frequenzgang angepasst The bass reflex version are optimised. The subwoofer achieves now 21 resp. 26 Hz (-8 resp. -3 dB). Despite a massive peak linear displacement volume of 1600 cm3 (diaphragm surface area x voice coil overhang) the subwoofer should not be tuned any lower, otherwise the diaphragm will starts wobbling.

This effect is easily noticeable in the closed cabinet version. Here the speaker leaves the linear range at more than 250 Watts and 20 Hz. The bass reflex version uses the rear radiation as well and around the resonance of the bass reflex tube this rear radiation contributes double to the volume compared to the front radiation. Therefore, the bass reflex version shows a considerably higher sound pressure level. DT 300

The sub may be used without its own amplification, however, we recommend:

- a module like RCM Detonation DT 300 (300 Watt RMS into 4 Ohm)
- or a module RCM Detonation DT 500 (500 Watt RMS into 4 Ohm)
- or Hypex HS 500 (720 Watt RMS into 4 Ohm).

The low bass properties of the DT300 are adjustable. We recommend, however, to use the neutral factory setting first. We believe it's the best setting for low bass and high volume.

The SPH-450/BR kit (low tuned bass reflex type II) for the SPH-450 TC contains:
- 1 x Monacor SPH-450 TC bass driver
- 1 x Detonation DT-300 amplifier module
- 8 x bass reflex tubes HP 100
- 1 x mat napped foam N30
- a set of screws with lockable nuts MZF-8688
- building instruction

For high performance, this is the right subwoofer. If this is still not enough we suggest to use two or four of them.

Price of bass reflex kit SPH-450/BR without cabinet: EUR 769,00

With Detonation DT 500 the output is 570 Watt RMS / 1100 Watt programme into 8 Ohm:
Price of 500 Watt version SPH-450/BR-500 with DT 500: - not available

Closed cabinet versions with 2 x 4.5 Ohm resistors (consisting of 20 resistors of 12 Ohm, five each in parallel, two of these in parallel): Price as bass reflex version

Please contact us for further versions or if you want something similar.

Building Instruction
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